Despite how cool Tirion Fordring is, this was is actually one of the more challenging topics for Know Your Lore. It's difficult to write about Tirion without just giving a summary of the book about him, becase there's not much more to him until Wrath of the Lich King. Even after reading this, I'm still going to strongly recommend that you go out and find a copy of the Chris Metzen written book Of Blood and Honor.
At the creation of the Order of the Silver Hand, Tirion Fordring was chosen to be among the first of the Paladins. Alongside him were people such as Saidan Dathrohan, Turalyon, Uther the Lightbringer, and Gavinrad the Dire (who!?). During the wars with the Orcish Horde, Tirion pretty much did what every other Paladin did: Kill a lot of Orcs and save a lot of lives. The real juicy stuff came a bit after that.